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Hello everyone, this problem we are given that we have to reduce pollution.
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Reduce pollution by 20 % so there are pollutants in the air.
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Let us take abc.
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So as given as abc, a is used to reduce by 50 unit.
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Let us take this to be equation number 1.
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B is used to be reduced by 100 unit.
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Let us take this to be equation 2.
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C is reduced by 75 unit.
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Let us take this to be equation number 3.
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So in the first method by using filters as given a by 1 by 2 unit.
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Let us take that to be equation number 4.
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B by 4 by 5 unit.
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Let us take that to be equation number 5.
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C by 1 unit.
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Let us take that to be equation number 6.
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So number of filter required by abc.
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Let us say that to be xyz.
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So x to be equals to 100.
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This is from equation 1 and 4.
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For b, one filter can be reduced.
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One filter can reduce 4 by 5 unit by unitary method.
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So 5 by 4 for b, 5 by 4 filter will be required.
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One unit.
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So y will be equals to 5 by 4 multiplied by 100.
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So it is 125.
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And for c, total of 75 filters required.
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So the total filter required will be the sum of all these three values...